function s1_hello(){
	echo "hello,world!"
}

function s2_tell_who_i_am(){
	echo "$(whoami)"
}
function s3_which_distro_do_i_use(){
	NAME="Beta Linux"
	echo $NAME
}
function s4_view_my_cpu_arch(){
	echo "$(uname -m)"
}
function s5_first_scsi_disk_size(){
        lsblk -l | \grep disk | \grep '^sda ' | awk '{print $4}'
}
function s6_show_main_memory_size_in_megabytes(){
	free -m | grep "Mem:" | awk '{print $2}'
}
